
COMSPHERE 392xPlus Modems
Status
Pwr
Alrm
142
Test
Dial
125
RI
Busy
Serv
SQ
1 ![]()
3
Port
2 ![]()
4
103
TXD
104
RXD
105
RTS
106
CTS
107
DSR
108
DTR
109
LSD
Front Panel
Spkr
3921Plus
FACEPLATE
EDGE CARD
CONNECTORS
BACK
CONNECTOR
PLATES
PORT
1
PORT
3
DTE A | DTE A |
PORT
2
PORT
4
DTE B | DTE B |
Figure 1-3. Model 3921Plus Multiport Modem
November 1996 |